BeagleBone Black Extracting eMMC contents
Thanks for building the eMMC extractor image, it really is a perfect way to deal with saving and restoring images.
However, did you have a chance to look at this discussion thread? Your recent edits on the wiki seem to keep blaming FAT, when that really isn't the problem and could potentially confuse people. The current build can't even write images larger than 2GB to ext partitions, so it is a limitation of the OS, not the filesystem. It is also very rare for a FAT partition to be non-FAT32 nowadays, as non-FAT32 FAT filesystems won't even support 4GB partitions, so that's almost certainly not an issue. While it's been quite a few years since I built the linux kernel, my cursory guess is that this image just wasn't built with large file support.
I'm not sure why 'dd' would have this limitation, but perhaps it does. I've added compression as the default to end-run the whole issue. It is possible I didn't build in large file support and I can look for that in the kernel build flags at some point. It seems pretty low priority to me since the compression should just work.